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Before April 2020, Tanya Zuckerbrot seemed to have it all. A wealthy Instagram influencer, she had a $22 million duplex on Park Avenue, a handsome-ish husband who worked in real estate, and three seemingly healthy kids. She was also a registered dietitian and the owner of a weight-loss empire called “The F-Factor Diet” (the “F” stands for fiber).

That empire came under fire when another Instagram influencer, Emily Gellis Lande, started posting screenshots from anonymous users who said they’d had bad experiences on the diet. The high-fiber, lean protein program boasts the tagline “eat carbs, dine out, drink alcohol, work out less.” It seems to involve a lot of protein powders and bars. Former clients claim the products gave them hives…

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